Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6156c7a4c57f4faae2af8ba2bbbef9b9c4825c050b7fa18f2287e3876c4c9f9b' 
  AND token = 'T9qh1D9umwI8qs5uDXnOa6ElpXAAtSG2Hqa3UtTnSoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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