Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087770310f20409bc7a8f6c9d483a039827b7024c9179df3d19073b3988c3f57' 
  AND token = 'stjXWwpCj5yyBbQiaYebIOhmJIqAcZWmtQy5dCvecCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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