Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9de1db1515085f44485967d01c0c8176fbda9d2cd41f6af5276d7ac087eb48' 
  AND token = 't4Tu8DJ9IOEK06GFaBN1Xl4RVhIeEwINrfhkR3cwG88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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