SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fac271a27fb67a67b00db69b2a10ba4cc04e09f885d67d5372b062c48b2026df' 
  AND token = 'JeC8LGYlF295fZZOJKzoLC3xab3AG9xCZVFaIQtcknY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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