Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b17e8dc3b116013084ee96d35cbb7a9dd10851344e135f3d88d223c99da46c2' 
  AND token = 'zsFdVco9IX4lNIiu1un2iZGbUOiKsDm9XlWTge3CUOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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