Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338e346a4fd274a3cea71395dffcde755fe68eeba698d06a71f2547bb46eb333' 
  AND token = 'oB+VIivQojKkvgQ8cLSJpbeER4CaXbMAdwa/6IZTCZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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