Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedbacf886ca07f0961bf08001958eadc2aba498da0c9b7026bed9e5fa4df784' 
  AND token = '6/SdyRd41e0t0Aii6YGBNH+YGN3o9mijL7SluGh65nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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