Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625bf9f2a630eaa5ccebd945c471da7b33ad53fc03b48ff3396166a58a9893c1' 
  AND token = '5ff16Z6HwPcdc1REzNlpBPJ+A6gU1nsCcYnXJRTEagA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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