On duplicate key update

[MrEnfurecido]

$sql = "INSERT INTO users (token,email) VALUES ('$token','$email')"
." ON DUPLICATE KEY UPDATE token = '$token', email= '$email';"

y la tabla:

CREATE TABLE users (
id int(20) NOT NULL AUTO_INCREMENT,
Token varchar(200) NOT NULL,
Email varchar(200) NOT NULL,
PRIMARY KEY (id),
UNIQUE KEY ( Email)
);

asi consigo lo que buscaba, gracias.