Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c77459e2d13fa688acb42e3dca8e45253860b936b00b05ecd085e51fb1ce6f' 
  AND token = 'rK1GlnqubYDNNf8FZCBjHTMr5YbZe9tintUFnRXz4jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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