Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f31bcf8ebfe3a281b4bb70d3a2a2d77bf099e5fcf708a24cb5c4f59e2776d1' 
  AND token = 'f1jEAnigfRYbw6Pfi2ZsrhOjVx90xFDwdJjHxJisp3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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