Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a439de145f15a53eebda0dc5ba2866c109cf3419e79f3a61c1aceee1def70e71' 
  AND token = '12r1KWbAGY4jVMjhyYskqPtNoaCo86XR5mLcZrILxx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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