Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e452503c687d1438da066230a3b6ca83433f8bc85dad21766d44933cefecbb' 
  AND token = 'aDzXqP0/Py6aYA/y5YpBly4ixEiVm/di5KMV1UanUhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}