Sometimes changing shoes can do it. Or just plain overuse. If it is constant and no other changes than the one episode of additional walking, then i would go see a foot dr to get xrays and see if need orthotic shoe inserts to provide better support.
I have had planter fasciitis before that feels like a knife in the middle of the foot. Anti-inflammatories, rest , and orthotics fixed it after a few months.
https://www.mayoclinic.org/diseases-conditions/plantar-fasciitis/diagnosis-treatment/drc-20354851
With overuse, there is a chance there is a stress fracture in one of the bones.