Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e7ba86d7fa9ffc473d07c3233c33bd5ec6b177742a1d8ee9cf2e04a15abf96' 
  AND token = 'mHgtnQzcNXiNyGFYSnIPhPmSTRlPNotUeAdR/gVqXYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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