Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620a7a5699390ac407ce74d93ca81bb6af93542ee828ccb672192ea0c33d6d49' 
  AND token = 'PP7j0QS/QlZvtrk0hgDG4yFdcfnHIfDV1Qqmua9v00w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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