Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9aa0bb5baae21b28ee644c8a9149a19acdcd13cc62608dfd64e76b5b2e1ae2' 
  AND token = 'WH3CwpMKxwKmozlCwayJx7nPzp4d7tgMjTo4a3i1xOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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