Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc5c1831ae1402d1d24986d8baa1540773936736b63976332e307c462bce00e' 
  AND token = '7QreHvKRs59YDjV34c3/crOby3IZIbhVFsiu2DDAR80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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