Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d9506b9fbb4b3b129c9ea964eb13ab2b4949e84a51e271c06ffbbd6d75f243' 
  AND token = 'KkQYfxLM78Z3xK3w+HN+VtR94Fe7W4WKlHuEDBlWuww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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