Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5492d365b21a095a4b0d6df814b0d5a8bda5c6d8ba398c8f66b28324fe539d8c' 
  AND token = 'd/J/Y9XT2UGfLU2zFvLlh0wL2DSarANiNvKFly27T/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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