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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f1eecfcbb7cc7ecd6382c59a0ffac48ae2219ea62bcb3e1d07f24c3ed9683c18' 
  AND token = 'zi520X/WBtjLeTh/I/lF81a/FdehYq5XkWVqC6Er4CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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