Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2531ce10ee12cc707938686b216064536771297de16e04bef3518b5d1f067d' 
  AND token = 'Z/xymU1ipMnDK5Mz5UrGoSpDYQWK1OCs/GEb91kshEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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