Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512caff8e165dde7c4050c85d7f73bca23591f6d65eb21e8f3afc582f9a55a87' 
  AND token = '3oswCFToVgumpgYkFuyp+RO4oDeAzTK+EAiUxPemt9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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