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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6eac1f8f02d52367e348a9ba528614ed8f9e857a9bf2c849fe6418b83d73b2b1' 
  AND token = 'VMBbwHHX79FxicdJDjmZ+sKX8CcFSe22kpuXKmHRVxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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