Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4d0eeef2a453da3932eeb1eb5fa5bb0857efe7890d71134317b15ca2020ea5' 
  AND token = '3XHcmbKwnXQv5Ed4IDy2JJg4VqGiPZg/V5g4z6JOBWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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