Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300f00947276268a21edc1b065e0a6e3683e9a0a0d82649ab8ff9dedd89d5c36' 
  AND token = 'aBy8RepVYRB4pUTJpKNHogfKXtPfA7YQxrKDgJQzfpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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