Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '26669b0e434724eca530bedb65a7bee9499b2fc1539f7c499786134caafb0dda' 
  AND token = 'krSiX7Uv5bureV0w0qI3RsR4vLZIGOlVrPxOqdoXq3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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