Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e75bc84c9aac937c74bfbf95619e7cc576d1c1663cbc09f7c2b8a08c52b81f' 
  AND token = '6xWKJaPrdHQLxBUvaPLnNbZc13Mk8/DJRLHF/bLE+lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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