Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f84f4fe7c62de19d0eb03eb46545156c1621c2edad104505ed8ac66e7c57c02' 
  AND token = 'GAKsxmLh5MtWTj2PsnY7nLGZgpFCrn0AQeyn/5wBQqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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