Jack is 80 proof, so 40% ethanol by volume. Meaning, 60% of it is water. Cheap tap water as well but that is neither here nor there....
The problem you may run into is whether or not any water gets under the keyboard as it can short electronic components out.
If this is some cheap keyboard you shouldn't give a shit. If it's a laptop, IMMEDIATELY place the laptop in a brown paper bag with a bowl of dry white rice for 2-3 days, unless you do not care about your laptop.
Spilled some water (not much) on a toshiba laptop (on the keyboard) and the next day it shorted out and went into the garbage can.