Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d1ef6ddd0439cd95ac57a43aaa593d3be3b7bcb96685efd88175a371dc23d4' 
  AND token = 'kPDs/YxjdlD2m0MtXTSO8K9s6SVtR3dZ/HIYmFB/ogs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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