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(Abridged) Soft and hard X-ray excesses, compared to the continuum power-lawshape between ~2-10 keV, are common features observed in the spectra of activegalactic nuclei (AGN) and are associated with the accretion disc-corona systemaround the supermassive black hole. However, the dominant process at work isstill highly debated and has been proposed to be either relativistic reflectionor Comptonisation. We aim to characterise the main X-ray spectral physicalcomponents from the bright bare Broad Line Seyfert 1 AGN Mrk 110, and thephysical process(es) at work in its disc-corona system viewed almost face-on.We perform the X-ray broad-band spectral analysis thanks to two simultaneousXMM-Newton and NuSTAR observations performed on November 16-17 2019 and April5-6 2020, we also use for the spectral analysis above 3 keV the deep NuSTARobservation obtained in January 2017. The broad-band X-ray spectra of Mrk 110are characterised by the presence of a prominent and absorption-free smoothsoft X-ray excess, moderately broad OVII and FeKalpha emission lines and a lackof a strong Compton hump. The continuum above ~3keV is very similar at bothepochs, while some variability (stronger when brighter) is present for the softX-ray excess. A combination of soft and hard Comptonisation by a warm and hotcorona, respectively, plus mildly relativistic disc reflection reproduce thebroadband X-ray continuum very well. The inferred warm corona temperature,kT_warm~0.3 keV, is similar to the values found in other sub-Eddington AGN,whereas the hot corona temperature, kT_hot~21-31 keV (depending mainly on theassumed hot corona geometry), is found to be in the lower range of the valuesmeasured in AGN.

The first simultaneous X-ray broad-band view of Mrk 110 with XMM-Newton and NuSTAR