Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd73e4d3b4cd6fb327f6798a6b26067fbed880dfc59dae7e91a28a4769ef90fd' 
  AND token = 'xuStK6pJ3KuvMLNkSWD5hVeh/mCXRH3bAZ3seM6wL/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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