Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d5c6adf89f1e5e5d8c921621aeecaca8dbc0ba843bc1c3f88f7a85987a2ef5' 
  AND token = 'tGApU+ibjHVUzCChDsQkZ3ZeRbrP2YHjCZqyshAhwCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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