Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef41df064a9a19d916e45249f34f234962c92f8350380e42619b97e33eb4d19c' 
  AND token = 'lcc9sB5mi6XB5O7n7+sayRSxlQ89+5agiMiugNKHw9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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