Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c0d851375dd58272369fabf38a1aa5995633d573d80b9a8bfb74fb0e0cf239' 
  AND token = 'qzFN7vU+wyIAXa3hYqw3eOnishNoDPfTtwmUEtqGUeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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