Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fdb0ddf12c0673c18590050fd8c72ec6ef6e0eb61d2799d037508b26b24636' 
  AND token = 'SLG2tH7i+BMF+Ob7F4EoKVH82qAXbDs+Ys30lv3mJPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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