Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b77e1d51fede6ab35f239c3fb2c7af1cb583644ec82efaa6c714991d60e392f' 
  AND token = '8wFVBf5gLFPAv9iw011d7ocYcNiJbsRsz9eAt50AMOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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