Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8f7d72679a6da150c915d8f1011a06bf87053adb73f9b6b86e308124d0f963' 
  AND token = '4oFVYCpIJklLwi0DZClrrcGRa8utMBUis19N6jwh7XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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