Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae5b970ebce2a3d05d39a927f481628819c7a888c692c56544a2d05371d5815b' 
  AND token = 'cVmsz+UtZV5WhJX83lqavQoOQeJ4HnQyJTHTT1Lx0hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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