Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdda40485788f3d02a3ce240995f16b8b97e61073ca66a2b971e3cc021e43b4a' 
  AND token = 'pKMju/UXYj8rjdQkvC8KRHdaiUj+pnG/MkbUIFscQUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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