Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9c941f5c47971e1ef23bbaeacc6489af1258f539748c152863fe4f4a97eeb6' 
  AND token = 'KSEZp8Why3ISOsFZxCFofH3g271sahQdEiB+hrkutWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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