Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3487ccd36ff6d1d0437163fc7f6b0585885d9626670a64e01a642ddeb5d306' 
  AND token = 'JpwRgm/0VR3/yU/CDfDcJSH8D43TQ7wAedAra/OKPtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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