Slow Queries

my site is face slow issue

i try to use Query Monitor and i see there is 4 Slow Queries

SELECT min(meta_value + 0)
FROM wp_posts AS p
LEFT JOIN wp_postmeta AS m
ON (p.ID = m.post_id)
WHERE meta_key IN (‘_salary_min’,’_salary_max’)
AND meta_value != ”
AND post_status = ‘publish’

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SELECT max(meta_value + 0)
FROM wp_posts AS p
LEFT JOIN wp_postmeta AS m
ON (p.ID = m.post_id)
WHERE meta_key IN (‘_salary_min’,’_salary_max’)
AND post_status = ‘publish’