Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9f02860b31e14192a2a396cc2cc6ddc90f75a8ee89a294bfd38f54978462de' 
  AND token = 'Lupbrtox9ETT0obprEoSoA4aIuHZ9LcvUQSZ7bSg5Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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