Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad894eb0f0a4eb866248086bb18ffb0ee17f05a45e8b6a5b10300c9db84e71d' 
  AND token = 'YzzCcZ3XfbfPaLdc5G8lzXrLZ9/CjBxLQHHcABabMi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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