Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376944853475700e626e624431e79cb83d43c34469e68bf0a5a7c61c7e3a6daa' 
  AND token = 'YbzwyoL4/a/b/AELBfyxArYijsMnKOul3eHUuG6GG34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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