Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bfd79e4158b608aae2d5998a0ddf58d6dcf4bdb760b112a200745a58ec3f52' 
  AND token = '6Lfm/Z4IVXCp0xVAj5YOZ9b4bnheeIHtt9oFh2kMcXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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