Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40388a7c227a998ba5cf30606ed9db9432255f9028b6c871bf8cb0c4a64256a4' 
  AND token = 'ivSHoIbbuiHZB8KzJd4GRFXgKcBcojgci64Ne3ACztQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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