Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b85a11a77bf24e6bd1628b7078c6b85dd29fccd2e07c40b17bd2b3f277cad5' 
  AND token = 'oQj4GJehuslinqzMZsS4v7NWnB9skpmAJqDdFrPSufE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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