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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '398e46357627b6d2f6b91c295a46596653403c8d7995ab29746263fba3b8462d' 
  AND token = 'X6BQG4MZM4qq+sn6gDlW2oFQxnGl7ubnpBekYFlY4LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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