Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a615a644ded034ab227eb2ec4655f7b38a0bbcaad1e6eeef5195a0d66147f0c' 
  AND token = 'YBX3G15WTpMqOE3b4ppQ0B7aJ9QTNgEst/99h9rqGCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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