Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13d64d1dcd6eed12412a240f53ee36fec6b0e6d2a9bf2e3b0e8e018d7c27de3' 
  AND token = 'vW0ThEQgSp3ILz983+P7hqYRmTqAHD5x8FMbnRhGQPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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