Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e3889f2b976d9f0313c20a71f521a3ddd8ffaa9a0a67f37f8ea7181d43ec71' 
  AND token = 'M4DSWHaKUy/NmLEx9lLm7pyen+iDAzLOE4e4PGv9c0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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