Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8915f794a539c1228f3210ccffb1c38900f763333e441e7ee7edcc5586afc2' 
  AND token = 'lEdpkQaoYZhSU6CGhXYvaJbxlI8K4lGF0rr1jlxFZMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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