Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239139bd9f59987aaa745f08a6bce59e27ac089ed2474a8fb35fe3504d2c462f' 
  AND token = 'k2kPVv7u0IIlxA6z1PoNoHtUDUQVkmaoLrhuKnXuWgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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