Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fc3b6571277487aaf8b3d6e81083216a6fe4d56a3aa145900b77947bbd4408' 
  AND token = 'TRdNa5VgpA0BGLN+SG3R+NtAIfxNnQH/UFLENrbPD8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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