Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ca47a95b33604f1d8ee84b73d79b39dbe5c695c32f56ec8a56bac533049413' 
  AND token = 'C/etx5RicQZMtPVfuogEI4p8bNSIKW1tCmcMZVV0A9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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