Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de1cc3691a8f5f9d6c66ececa2dcce8abee3b9013b80c40249513afaa60d731' 
  AND token = 'sDfF31SSNpY0/gqW43eAZkWCfIWt8VGgi21knZjhlf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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