Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c363a9223a7e485daaf1341e732f798ee82347d2efbb3cc4ecb9c6a25528e891' 
  AND token = 'KbJN2fXFdEKHcaRp2Bz9uBdXxDyDrAwoc6j5Ws9OQns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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