Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219b439eaf7e57bebe06f3c119c1e33a6a3866e7659246e7d5e29bbb6da0917b' 
  AND token = 'vjzEejIkrzOsHAjmbF8+InFnUbwCFQ4n5vA3f1Qnjg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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