Put some foot powder in your socks. Couple weeks of this and you will be fixed-up fine. If you can, change socks often too.
When I was in the military, I used to be stuck in leather, steel-toed boots for hours at a time. Got athlete's foot. I found some good foot-powder that worked great. I tried some of the name-brad stuff but it didn't do the trick as well.
The one that I found that worked best was one with "Tolnaftate" as the active ingredient.
They have creams with Tolnaftate too, but the powder is good because it absorbs moisture and keeps your feet dry too.
Dry feet + Tolnaftate = Athlete's Foot Hell.