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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '384b1bc768aa0f9a5acc0b9bec1d08c85d4432bee51ba3d32e2f7faf6b3426db' 
  AND token = '3FiR4VfXRL1rl3/xqt3gmhuHgiqLFpuZgXyOYYpeTbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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