Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5f2e88653332277bdd245d8d532190c8f5f4027e9a322ab521ee1c1ae37b41' 
  AND token = '8kXNm9dqpOpuVcvPUJrY96jxMJqkitqEN8fCamGkQhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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