Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79918f39354184501146336fc845311d00e97d15b62895c64b4d1c17549c4b36' 
  AND token = 'xlfYY0ubL1QsmITm19AmnLxzGYESewqf7NQ24lF/BHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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