Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b921ceaa8dea7d79fdc55d3d2c9de2a189cacd7f799bfcbe932fb2073ebcbf' 
  AND token = 'FU9kenFWBCeJigGsAXh7QeAWYLOzyHz/1MS0udeus3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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