Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c40988f9e28e5414df1b9c869031194b8430d30814e7d101c120f114413b66c' 
  AND token = 'm+bfLHEzfMEk5BOyPwqHRpqrx/XBhR5NgVSP0urKqvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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