Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c53ce9cbc71cc9ef4e2606688f882916a2a979179499897974f06e646b4c30' 
  AND token = '4Yat/juP5LoidzHcSvgyuYsEjCzDHAUBTk+aWlSV+iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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