Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d3610bb5f4a257d67bd6bae668e2b8fc4e52d282574a0b5197ffda65ba22ca' 
  AND token = 'Dc5KvL0bB5wKoU53Nvt7hDM+jOhdrBbHW8fFyzxU/28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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