Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdbfb50b4f6a37bb2f520dcbb63b113699e6d0afdc6a635d5b97c245146b4df' 
  AND token = 'MH7jOHEGte0iqm2ZuKtS9OsKBndxHwBYjOviD5GQOuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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