Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173ebcb8efe50bc00bba904cb70180b50bef4ded5b1319fb33cc59b6d9190a4e' 
  AND token = 'Qs1FezFyaItPFN9jEV4oibNkIFpqnlQfLNtxs7zJf8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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