Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c0ffbf89ec61ee78a626223fbbf1027a0d7e5daa0c1e33388aab8d6c047cf7' 
  AND token = 'lUeIhAL5A3v8LFF3s9KCTnNYNrWR1J00P6Rd3ZzpJHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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