Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0ba16eb6c9a0c4178337595b7afcbb2b715ee5d6417e758ecff3b23f40f532' 
  AND token = 'cnAQRU/uDlnv44HZwgqZNbj0HFsL7brwJ0+rW4HksN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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