Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d5b2e6dfd2e7860ad443ef4eb4191095c1d3d982021d0dab77616fbcec4772' 
  AND token = 'TixEtccFYXmfB+F4aIspAHEwhv1DA+DS3K2VRXJhCbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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