Try using the 'relation' option for meta_query.
Also I suggest for you to use the pre_get_posts fiter to "hack" into the search query if you are using the actual search.php template to display the search items so you would write in your functions.php instead of the template file something like this:
function search_filter($query) {
if ( !is_admin() && $query->is_main_query() ) {
if ($query->is_search) {
$meta_args = array(
'relation' => 'OR',
array(
'key' => 'treatments',
'value' => $s,
'compare' => 'LIKE',
),
array(
'key' => 'address',
'value' => $s,
'compare' => 'LIKE',
),
);
$query->set('post_type', 'beauty_salon');
$query->set('meta_query', $meta_args);
}
}
}
add_action('pre_get_posts','search_filter');