Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f9702ff501feacbaccc4effe4d2be17bce49eeda972d48d1d2707e6b1e650c' 
  AND token = '3MO0Y+yFLHfeMj92GbRVsSBZuLsj0dbNYvr2m1xBGDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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