Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2d3c7f7c8ce1bda461c8a5c6b6bc6b1852e5cec21b5071f4cf88aabc17d43f' 
  AND token = 'j0TSuDEClYS/2jDlz8Ar/QwlyOlmeoTidKsAw1hyXBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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