I wouldn't worry about it.
My key washing experience -
2000 VW "switchblade" style key - washed and dried 3-4 times and it was fine...it was not fine after leaving it in my pocket and getting into a hot tub for a 30+ min soak
2008 Nissan "smart key" style key - washed and dried once, didn't work for about a day then was fine.
2006 Nissan key fob - washed and dried a couple of times, generally 'wet' from outdoor activities several times (this is a truck key) - works fine, still in service.
2011 Honda Ody. key - washed/dried about a week after we got it...no problems at all, took it right out of the drier and tried it out, still was fine.