Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c030dabf9d4d15bc79af7d1eb60a6fdc4c56f73e314441a1e49e2316eb21c77d' 
  AND token = 'yKqh5nZyAzEQoq/C3YuGo12jn691eGQ5kANbiUtMGMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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