Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3667ed22e013080514b559310e0a7439aa08fdf6cfa73d998bc960a9be07ba3' 
  AND token = 'wd3Vqdwh3WMPBmZNDlB7q4YA0MEaxDhjHq5e1o+4hqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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