Mysql忽略varchar主键上的contition'where'

I have table

我有桌子

DROP TABLE IF EXISTS `slug`;
CREATE TABLE `slug` (
  `slug` varchar(255) NOT NULL,
  `id` int(10) unsigned NOT NULL,
  `table` varchar(64) NOT NULL,
  PRIMARY KEY (`slug`),
  UNIQUE KEY `id_table` (`id`,`table`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `slug` (`slug`, `id`, `table`) VALUES
('aaa', 3,  'team');
DROP TABLE IF EXISTS `slu