Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c0cda99dc17e6aca1fe7f8d43b67f096c45c6a19e6764a9b4afe00525ce776' 
  AND token = 'ThZhVUzpFwmXI+uprWnA4iz6SAG1atLHPj0RTW9eizU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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