Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4c44eaa9bc3600ce4a2d077e33719da37af48e79a3fc89f3e567c425891f4c' 
  AND token = 'eIdFNfrSNJ8E4goND15W/9TtskWt4FwoKMRSkViDc7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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