Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0440a7cd7143f34174fb7cab0ab1813b87db11dd7dd0a0da346fcd1df13fa8b6' 
  AND token = 'nhU7icQ//1xvVj2wWcmO8v8qFwOdlGDwVa0knxQOSA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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