Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc1504142f40f466c14d25a237dedad57275c5e2134eed5149cd87cce02d2e5' 
  AND token = 'WD7BdT3A15Xv57XLbdmu+Ki+/GtFYiIfWczbJHflz+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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