Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39b96a5d2f47f4c470ee4dead224441c9b87d0ecba4b85e1e35ee0231b02618' 
  AND token = 'XLuAYLLYY5A/kA4DXhOareqmaNRzfbOCzjlGg+WzTN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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