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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aea5f7d1a556fb43863ac262cb0810f4a664a97bc1f4fef0457020a255264070' 
  AND token = 'xXrHH9WXTaw16HP1RXruiRkWqn3u78D72FYOn/vbeRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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