Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793ecf871560a6d81362a6472ed36a692a9bebaf17103769240134294f993b49' 
  AND token = 'RUU3MyEvu2N9Ll5cGfdkKy53/63gjRC+KK30Wi7e3vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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