Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c7950eaebcaecaa966f45379272c241cdf6336b8e8c5391eaf3365086f07ba' 
  AND token = 'NZRl0EQ1pFRVwWXAq6Ap7cZo1gTH0SR6Dico8dz4lHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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