Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386f645eec9f9c77faabfba1e27a3f7da8d5aa7a43b287889ac8eb8c0f79cf2a' 
  AND token = 'nxpW8LxQBxxLSdE6+s1WFhBSYf02hYr1hNSb7U/UUUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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