Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4d491ef7909e9290caa477de67d2e1c740f109a1b1b501879133e9c33fea2b' 
  AND token = 'Z3Bi1CCAvf+oMTUUhVWyI4CEPPnxsvtQ9cUiPJxBr84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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