Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d12fa16c78a219b864636effeeb1c12e576f25e4718104ef10e1d896000a18' 
  AND token = 'YtUBBu2Si6gC6hlMWWicpCJk47ylx/sb6M1phnvUrHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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