Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4523ddcecd8c85fde0e3915bd39ee7d6752d222eb689e5b9de2e1b0a39a7f40f' 
  AND token = 'SaNi1gGoWvMhNaMYK2JhP+6DCdK3M1qPupnOiq9tCbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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