Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35fba3c458ced219d604fe010851dacea53430be7e1a8b5596fa7f9844b7ffc' 
  AND token = 'EIPMV2zGb2ZoQWkrQs0IheUsNSr6n/0Bk7tCq2DpjT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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