Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c6f4ecdcec5bba9395f8a821ee00adcadca6404b227921eddd2a9b67e13b60' 
  AND token = '8tHjGcvZV7FVrNnn9cQ7/ylmqDS/w69rELvoJcu1wCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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