Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea54308f927bee68ddfb6a113e81d64193dca263cf9327c833daab85f9426b0' 
  AND token = 'OHXlLacUqsL303QdZ6aa8k5nMSae3nopOWBupH+HeBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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