Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a2a4c3198a25088eb577d5982a279fdebb573b0c6b7cd0075a125185874f17' 
  AND token = 'YDej6ZFyOI7UOoVhmLnaj2+cjsFi9oRuONp3YQpbBi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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