Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ffdb61f5cc4e822b0dd1f676b9c327b4cef0616c9fe51ca843efe8cfceb706' 
  AND token = '9JkJ7k9iSoEDLvwwWWzVdkgI1ji39wfyj/EfPjqQKjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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