Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbb089d549acb225a876fd1d591bc9b78ed73ecb3f7f4d6244187e266c21820' 
  AND token = 'IVmqrYKapWdYdimbIcFs/SFtBO9IqbRVyaZ+FEAV5X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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