SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3863515aa942759946acf03e779ddfbbd0bea7bc8861c0eb48c3cf0c59e581f7' 
  AND token = 'k6rn+bz372vhcZegOGZPBlJnBfwWTmPp71rJPnNw8Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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