SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '577c75d8904f42a2c1356ca69e4a46012ebba42ee20ba9ac8621398df2c00c71' 
  AND token = 'gcJvV5lgFCTZM2ywrTL6EYgqT5LjaHTiYN+QDLo/JNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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