SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '47948d6d68f3dd1d85cae77af9557e71f8d95daa1aff27c3564da9275778e2cb' 
  AND token = 'kKr3UO0uFF0VpLXNY3sV36KoWozGswRwSl35lv0EJZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}