Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34d11d37ab28760cb8e5dbaa611aae6ccdce53d8fb1e6dc9effec2764c773c2' 
  AND token = 'cz67BSW24Wn7/IKnUo++M7nVYcYlV7fZbRKdgn48F7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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