  We investigate whether there is a variation in the orbital period of the
short-period brown dwarf-mass KELT-1\,b, which is one of the best candidates to
observe orbital decay. We obtain 19 high-precision transit light curves of the
target using six different telescopes. We add all precise and complete transit
light curves from open databases and the literature, as well as the available
TESS observations from sectors 17 and 57, to form a transit timing variation
(TTV) diagram spanning more than 10 years of observations. The analysis of the
TTV diagram, however, is inconclusive in terms of a secular or periodic
variation, hinting that the system might have synchronized. We update the
transit ephemeris and determine an informative lower limit for the reduced
tidal quality parameter of its host star of Q$_{\star}^{\prime} > (8.5 \pm 3.9)
\times 10^{6}$ assuming that the stellar rotation is not yet synchronised.
Using our new photometric observations, published light curves, the TESS data,
archival radial velocities and broadband magnitudes, we also update the
measured parameters of the system. Our results are in good agreement with those
found in previous analyses.
