Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a87adfc70d8f5377b6340f6d9bb8dc1600c94bb997aaa9c97bc1ad13ce7505' 
  AND token = '3d1fWLz9P6I1h0ZheNmoM+2cBlZj1sI8Z8KIs7beu/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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