SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ef688b5f34658a426933578fa5e4d4ee56a17f7ea3c317724bbd5f7a0baadd1' 
  AND token = 'eYU5NuUJxDpVIvVvLMROS+KMs6y8kzqMgjzHzxW0YVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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