If other key holder reads this,(hi Mike8) don't worry there will be more chances for you to use the key.
You are too nice. Unfortunately I just cannot come for your (super cool) puzzles often enough, so the chance to miss that is pretty big; but no problem really.
I've seen the key too, but I just didn't have the time to research what could it mean.
But I've got the current prize

It was 100 DOGE, thank you.
The answer is 29, since a year of Saturn is 29.4571 years.