Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ccd342028ae893f37709fec1cd727f1373579155eb1971c0b76028ebd54f0f' 
  AND token = 'TxXeeWEJ3VWvAuXA0MteprIdskw4eperZ1nItx0z6Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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