Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c0a6c7e9db6b77d9ff852bf77e023abd2468b74b86b6536f6ed4bffa326c10' 
  AND token = 'CJqV9seixzMMrTtRmdYkp6BqDfWiQ2v+DZXoZ11UxsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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