Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd7067683ea1c3d104af81a926624a7246a7821de543f296ed2faf6e50d9fa4' 
  AND token = 'LDUJXZKwbJa46nyHGYLMa1TjsSA2o/xAmpNa9+jHnTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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