Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56891cf52a6f88bfb5ee0dcbf08faf07bac3ff1cabf8b5907641b0f7ef5c4658' 
  AND token = '55E8qs/eRWUZ98VQuT3f09XYLrkzHYPLayqWH/ZEP8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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