Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed1dcdd2db53175ac53aa0dd14f92737a516ff31007b9220dd1050441f1cee3' 
  AND token = 'e9kkkmtOD7UZ90IKqeOJGaSy7YzvV1hGp4Z08SXpj9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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