$html = file_get_contents($valores);
$buscarCodigo = explode('<source id="urlVideo" src="', $html);
$buscarCodigo = explode('" type="video/mp4"', $buscarCodigo[1]);
echo ' Url encriptada '.$buscarCodigo[0];
// resultado nessa demonstração https://www.nomedosite.com/inc/video.inc.php?&file=NSw2MGYyNDAyZjFiYTI0Njhl&token=OsxXuBMTUzNzc2ODY4Nw==