Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d8137210bc276a3631f99cf65a69650e63c6f4fb8330ca3951ad2147ac033d' 
  AND token = 'Szzsx2Y5vqdoc7fGKsACPalInG7kRvenaFF0KCCqPYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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