Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a688d1743db5e422beaea6a8f07a36c1dd734f69a4cfb3838c7dc134d4d07d8' 
  AND token = 'mxTeogVJAz7lRU5Lcb1jCXoEP3zJOUMMTzKxG3JxKck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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