Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da8eea70d30c9ca0c09a43084a9bbb290c5a317b0937725b798d24a2110fb70' 
  AND token = 'J1QWI1dSvJwq+dlQ4IWyAzyZaCvLLSu7tVw+LRPkH1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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