Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70215d785ed2fa117ea247f0a42c2bfd3efc083be80e0edcfced54a42ed0d5e1' 
  AND token = 'kwfRAtXQQST82RAGAKr3iT4DBR6T1b04tkTrDCua1MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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