Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a77a250ab9d010b50081b443373cf7bee423a69169222944ab6496ee924d07' 
  AND token = 'sLAjiNrT0qsjrF3EWfXWvqYexpcX7PyTT+dlKUl/anU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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