Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400a83d47017afc295830dcf6a0d49d354c01c38a11dfb20c052a8b1e60732d3' 
  AND token = 'NjWrAnjnOu4Udpe5X8yNKDfHBoAqdKLukw6SLkcP2wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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