Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb0e2fe0b6784aa2a0e3e058b7d19d329c22ac186ee2667cfec866f1ceff049' 
  AND token = 'xTg8/nT8CIJzAYQ02c4L8MxVgzE7vSqwTcEcZK+TgJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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