Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c68da6cd28f4a61a9eacd7a67899b72b0f09b86d524f54155fff1d6314e818c' 
  AND token = 'hGCMW0WaTGhTpiVPgbfDu/ExAGqhbgey5g9WHILKQWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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