Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8af0e2fe638e23ddb877a5b60a16695078d98571c115de32332e8e234ed36af' 
  AND token = '3kn5o4+jL2DiZ17O0/bux4NT54QjEvwrTuZMJWR6BVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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