Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6e4476c71a754509aadaaa9adbb3954a3c246984dac6418cca9f4c29264718' 
  AND token = 'j/e1VPUJdFyPlKld3Y8GW83tLrkZp/qjprqMF0AkoBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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