Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859fb18387d852f9366acb8a6a11f201c46221502021da8635fba41f52ba604b' 
  AND token = 'H3bBWASkVW6sUQ3qsAzvpmCLGGI7FU9dMAoyZYAcbcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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